Telegraphy



(No Model.)

P. P. JAMIESON.

TBLBGRAPHY.

Patented Dec. 18, 1888.

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WITNESSES:

INVENTOR:

ATTORNEYS.

N. PETERS. Imam-Lithographer. wumnmmu c.

UNITED STATES PATENT OFFICE.

PERCY FRENCH JAMIESON, OF BATAVIA, OHIO.

TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 394,697, dated December18, 1888.

Application filed September 24, 1888. Serial No. 286,158. (No model.)

To all whom, it may concern:

Be it known that I, PERCY FRENCH JAMIE- SON, of Batavia, in the countyof Olermont and State of Ohio, have invented new and useful Improvementsin Telegraphy, of which the following is a specification, referencebeing had to the annexed drawings, forming a part thereof, in which-Figure 1 is a side elevation of my improved telegraph-key, showing therelay, battery, and sounder diagrammatically; and Fig. 2 is a frontelevation of my improved telegraph-key, partly in section.

Similar letters of reference indicate corresponding parts in bothfigures.

The object of my invention is to provide a telegraph system in which thekey used in sending messages will automatically close the circuit assoon as released by the operator, thereby avoiding the necessity ofswitches and the inconvenience arising from leaving the line open.

My invention consists in the construction and arrangement of the parts,as will be hereinafte fully described and specifically claimed.

In carrying out my invention I employ a key similar to an ordinarytelegraph-key, but arranged to make and break the circuit on the backcontact, so that the circuit is always closed for the spaces and openedfor the i11- tervals representing the dots and dashes ot' the signal orcharacter, and I connect there with relays in which the electricalcontact is removed from the front of the relay-arm to the rear thereof,so that when the circuit is opened by the key it is closed by the relay,thereby giving in the local circuit impulses which cause the message tobe delivered direct by the sounder.

The key-lever A is provided with a trunnion, B, which turns in bearingsin the screws a b, the bearing in the screw a being of insulatingmaterial to prevent the current from passing throi'igh the said screw tothe key. The key carries, forward of the trunnion, a contact-piece, c,of insulatingmaterial, which strikes upon the ordinary anvil, (Z, whenthe key is depressed. The rear end of the key A is provided with anelectrical contactscrew, e, which is capable of striking the anvil f.

The base C of the key supports the ears g g, in which are inserted thescrews a b, the said ears being insulated from the base. The leg I)communicates electrically with the base C. The leg I) is insulated fromthe base C and is connected electrically with the ear g by the conductorh,

The relay E, which is placed in the line-circuit, is of the usualconstruction, with the exception of the replacement of the front contactwith a plug, i, of insulating material, and arranging the electricalcontact j with the back of the armature-lever K. The local sounder F isalso of the usual construction, and is connected with the local batteryG and relay E in the usual way. The leg D of the key is connected withthe line-wire H, and one terminal of the relay E is connected with theground or with a return-wire. The spring Zis electrically insulated fromthe key, and the bearings of the trunnions of the key are preferablymade of insulating material. \Vhen the key is depressed, theline-circuit is broken between the contact-screw e and anvil f, thusallowing the armature-lever K of the relay to fall back and complete thelocal circuit, causing the sounder F to make a downstroke. When the keyis released, the spring Z raises the forward end thereof and brings thescrew 6 into contact with the anvil f, thus completing the local circuitand causing the armature-lever K of the relay E to be drawn forward,breaking the local circuit, and thus permitting the sounder F to make aback-stroke.

Having 111 ns described my in vention, I claim as new and desire tosecure by Letters Patentl. The combination, with the base t, havingforward and rear anvils, d f, the legs D D, the latter leg beinginsulated from the base, and ears g g, insulated from the base andprox'ided with screws a b, and the conductor 72, leading from ear g tothe leg D, of the key-levers A, having trunnions B journaled in the saidscrews and insulated from the screw (1, the forward eontact-piece,c, ofinsulatin g material, the electrical contact screw 6 at the rear end ofthe lever, and the spring Z between the key and base and insulated fromthe key, substantially as set forth.

2. A telegraph system consisting in a key comprising a. base, 0, havingfront and rear anvils, d f, the legs D D, the latter being insulatedfrom the base, the ears g g, insulated from the base and provided Withscrews a b, the former having an insulating-bearing", the conductor h,leading from ear g to leg D,

the key-lever A, having trunnions B jour naled in the screw-bearings,the forward contact-piece, c, of insulating material, the electricalcontact-screw c at the rear end of the IQ lever, the insulated spring I,the relay E, hav-

